Look at the following reaction. O The Stoichiometry for this reaction affects yo

Question

Look at the following reaction. O The Stoichiometry for this reaction affects your calculations for AG SO3 (g) 2SO2 (g) O2 (g) O To calculate AG for the decomposition of one mole Suppose that you are given the following information for of SO3(g), you use the expression AGO (AGof for this reaction at room temperature: O2 AG for SO (AGOf for SO 2)- AGof for SO2(g) 300.19 kJ /mol O If AG is negative, the reaction is spontaneous AGof for O20g 30.0 kJ /mol O The values for AG from the tables are given for AGOf for SO3 (g) 371.1 mo one mole of substance. Which statement about this reaction is not correct?

Explanation / Answer

Ans. 1. Statement B is incorrect. Note the stoichiometry of balanced reaction, 2 mol SO3 decomposes into 2 mol SO2 and 1 mol O2. So, the dG of the reaction is given according to the stoichiometry of balanced reaction-

            dG0 = (dG0f for O2 + 2 x dG0f for SO2) – (2 x dG0f for SO3)

Statement A is correct because stoichiometry affects dG0 calculation as shown above.

Statement C is correct. A reaction with negative dG0 is spontaneous, i.e. favors product formation.

Statement D is also correct that the table gives dG0f values for 1 mol of chemical species.

Ans 2. Statement C is incorrect. At dG = 0, the reaction is equilibrium and reaction favored neither towards the reactants nor towards the products- not even the slightest.

Option A is correct as dG is often mentioned as kJ/mol

Option B is correct as a positive dG indicates the reaction to be favored in backward direction forming the reactants.

Option D. correct.   See 1C.

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